/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesInterface/Public/Online/Auth.h
Authenticate a local user. If necessary, retrieve and maintain an access token for the duration of the auth session.
[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FAuthLogin](API\Plugins\OnlineServicesInterface\Online\FAuthLogin) > Login ( [FAuthLogin::Params](API\Plugins\OnlineServicesInterface\Online\FAuthLogin\Params) && Params )